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Re: [E.Kowallik@tu-bs.de: [linux-lvm] lvm and raw devices (with Oracle 9 RAC)]



On Wed, Jul 03, 2002 at 07:51:15PM +0200, Eike Kowallik wrote:
> Hello!
> 
> Hmm...  nobody can give me a hint? Are my problems and my questions
> so strange??

No, it is because we are all at the beach ;-)

You are using a rather old LVM version. In case you can afford an upgrade
to LVM 1, your problem will be gone.

# raw -qa
/dev/raw/raw1:  bound to major 58, minor 0
dd if=/dev/raw/raw1 of=/dev/null bs=512 count=10
10+0 records in
10+0 records out

Regards,
Heinz    -- The LVM Guy --


> 
> As I wrote everything works fine with real hard disk partitions
> for the binding of the raw devices - but with logical volumes it
> doesn't work anymore... :-(
> 
> Bye, Eike
> 
> 
> ----- Forwarded message from Eike Kowallik <E Kowallik tu-bs de> -----
> 
> From: Eike Kowallik <E Kowallik tu-bs de>
> To: Linux LVM Mailinglist <linux-lvm sistina com>
> 
> Date: Mon, 24 Jun 2002 04:29:08 +0200
> 
> 
> Hello!
> 
> During the installation of a 2-node Oracle 9.0.1 cluster using both
> lvm and raw devices I meet a problem that is independent of Oracle -
> at least it seems to me like that...
> 
> When I'm binding my raw devices used for Oracle to real hard disk
> partitions everythings works fine. But with the binding to my created
> logical volumes I'm receiving errors from Oracle. And I need more raw
> partitions on the shared disk than Linux can support (due to the one
> byte minor device number limit). In general I would like to have the
> great flexibility of the lvm. ;-)
> 
> So I tried to find out what the reason for the problem is and found
> amongst other things the following threads:
> 
>    [linux-lvm] Using Oracle with lvm AND rawio: read(512) from /dev/raw/... 
>    http://lists.sistina.com/pipermail/linux-lvm/2000-December/003730.html
> 
>    confused about raw-io blocksizes
>    Date: Fri Nov 09 2001 - 19:13:11 EST
>    http://www.uwsg.iu.edu/hypermail/linux/kernel/0111.1/0472.html
> 
>    [suse-oracle] ORA-27044 to create tablespace (Re: [suse-oracle] Raw device)
>    http://lists.suse.com/archive/suse-oracle/2002-Feb/0054.html
> 
> 
> I tested to read 1k, 2k, 4k and 8k blocks from my raw devices, bound
> to logical volumes - everything ok, here for the first raw device:
> 
> $ dd if=/dev/raw/raw1 of=/dev/null bs=1k count=1000
> 1000+0 records in
> 1000+0 records out
> $ dd if=/dev/raw/raw1 of=/dev/null bs=2k count=1000
> 1000+0 records in
> 1000+0 records out
> $ dd if=/dev/raw/raw1 of=/dev/null bs=4k count=1000
> 1000+0 records in
> 1000+0 records out
> $ dd if=/dev/raw/raw1 of=/dev/null bs=8k count=1000
> 1000+0 records in
> 1000+0 records out
> 
> BUT with a block size of 512:
> 
> $ dd if=/dev/raw/raw1 of=/dev/null bs=512 count=1000
> dd: reading `/dev/raw/raw1': Invalid argument
> 0+0 records in
> 0+0 records out
> $
> 
> You will find the same error message in the threads above. And _all_
> the tests, even the one with a block size of 512 bytes, are running
> instead _without_ any errors when the used raw devices are bound to
> real disk partitions!
> 
> I'm using stock Red Hat 7.1 with some changes made for the Oracle RAC.
> My concrete problem is that I'm not able to find any concrete hint
> about what to do. Do I need a newer lvm version? If so, which one?
> Red Hat 7.1 comes with
> 
>    # grep -i lvm /var/log/messages.1 | tail -2
>    Jun 14 22:26:08 linmi04 kernel: LVM version 0.9.1_beta2  by Heinz Mauelshagen  (18/01/2001)
>    Jun 14 22:26:08 linmi04 kernel: lvm -- Module successfully initialized
> 
> but without the lvm userland tools, so I installed the appropriate
> version of them.
> 
> Or is it (also) a kernel problem? I have to use a recent 2.4 kernel?
> I needed (for the Oracle RAC) to compile the Red Hat kernel:
> 
>    $ rpm -q kernel-source
>    kernel-source-2.4.2-2
> 
> What's about lvm patches? According to PATCHES/README it shouldn't be
> necessary for 2.4 kernels ("little more than update the lvm source files").
> And BLOCK_SIZE in lvm.h? In the thread of this mailing list from
> December of 2000 (please have a look above) I couldn't find an answer.
> 
> It's perhaps a little bit off topic here, but due to the certification
> of Oracle 9.0.1 RAC for Red Hat 7.1 I'm interested in statements about
> using lvm and raw devices (for Oracle RAC) with Red Hat kernels, too.
> Perhaps I need just to upgrade to the Red Hat 2.4.9-34 kernel rpm's
> (there is no newer one for Red Hat 7.1)...  but I don't want to try
> just something out, instead I would like to understand the problem -
> and to apply a good solution then. ;-)
> 
> Thanks in advance && bye, Eike
> 
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm sistina com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
> 
> ----- End forwarded message -----
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm sistina com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen Sistina com                           +49 2626 141200
                                                       FAX 924446
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